"To complete a drawing you may need to trace and transfer a structural sketch. A lightbox illuminates the image from behind, allowing you to trace a structural sketch onto drawing paper. Another method is to transfer a structural sketch onto drawing paper with transfer paper (also called graphite paper). To use transfer paper, place it between the structural sketch and the drawing paper (on the bottom). Redraw the structural sketch with a hard lead pencil so the image is pressed onto the drawing paper. Transfer paper can be purchased ready for use, but you can also make your own with tracing paper and a graphite pencil: Cover one side of a sheet of tracing paper with soft graphite, then wipe across the surface with a cotton ball slightly dampened with rubbing alcohol to bind the graphite to the tracing paper."